US4074283A - Non-mechanical printer operating in accordance with an electrographic process - Google Patents

Non-mechanical printer operating in accordance with an electrographic process Download PDF

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Publication number
US4074283A
US4074283A US05/681,726 US68172676A US4074283A US 4074283 A US4074283 A US 4074283A US 68172676 A US68172676 A US 68172676A US 4074283 A US4074283 A US 4074283A
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US
United States
Prior art keywords
data carrier
recording head
gas
drum
gas bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/681,726
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English (en)
Inventor
Wolfgang Fink
Peter Graf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wincor Nixdorf International GmbH
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
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Publication of US4074283A publication Critical patent/US4074283A/en
Assigned to SIEMENS NIXDORF INFORMATIONSSYSTEME AG reassignment SIEMENS NIXDORF INFORMATIONSSYSTEME AG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SIEMENS AKTIENGESELLSCHAFT A GERMAN CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/321—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image

Definitions

  • This invention relates generally to the field of electrostatic printing and more particularly to an improved non-mechanical printer for use in an electrographic printing process.
  • Mechanical printers are not suitable for printing at high speeds, e.g., more than 10,000 lines per minute. Instead, in connection with high speed printing, a number of processes employing non-mechanical printing, such as, for example, electrostatic printing, have been developed.
  • the electro-photographic process In the field of electrostatic printing it is desirable to distinguish between two processes: the electro-photographic process and the electrographic process.
  • a layer of photo-conductive material In the electro-photographic printing or recording process, a layer of photo-conductive material is uniformly charged with a positive charge by means of a corona discharge.
  • the character or the like which is to be printed is then optically projected onto the photo-conductive material, as a result of which the material becomes conductive at the illuminated points and the previously existing positive charge disappears.
  • the print is rendered visual with a colored powder (the toner) which is positively charged and which adheres to the discharged points, but is repelled by the non-illuminated, still-charged points of the data carrier.
  • a data carrier composed of an insulating top layer and a conductive carrier layer is printed upon.
  • a charge image corresponding to the characters which are to be printed is applied to the data carrier by a corona discharge or the like.
  • the charge of the insulating top layer may be positive, in which event the charge image is visualized by a negatively charged toner.
  • Transfer printing processes can be used for printing on normal paper.
  • the data carrier is in the form of an intermediate carrier, e.g., a drum upon which the charge images are produced. After the charge images have been developed on the intermediate carrier, they are transferred to the normal paper and fixed.
  • a so-called recording head is used to apply the charge images to the data carrier and can be of such known construction as, for example, an electrode comb.
  • the distance between the recording head and the data carrier be as short as possible. In addition the distance must be maintained as constant as possible. In previously known processes the special paper has been brought in contact with the electrographic recording head, as a consequence of which a minimum distance between the recording head and the data carrier has been produced. If, on the other hand, the transfer process is used, it is not possible to achieve such a small and constant distance between the recording head and the data carrier as a consequence of the lack of roundness of the intermediate carrier (for example, a drum), and as a result of the wear due to the contact between the recording head and the intermediate carrier.
  • the intermediate carrier for example, a drum
  • An object of the present invention involves the provision of a non-mechanical printer in which the distance between the recording head and the data carrier is small and is maintained at a constant value.
  • this object is realized by virtue of a cushion of gas which is produced on the surface of the data carrier, the recording head floating on said cushion. With the aid of the gas flowing out of nozzles this cushion of gas between the recording head and the data carrier can be produced such that the distance between the data carrier and the recording head is approximately 10 ⁇ m.
  • FIG. 1 is a somewhat diagrammatic elevational front view of a non-mechanical printer with portions shown in section.
  • FIG. 2 is an end view of the structure shown in FIG. 1.
  • FIG. 1 illustrates a non-mechanical printer constructed in accordance with the principles of the present invention and indicated generally at reference character P.
  • the printer P is particularly adapted for use in a transfer electrographic printing process in which the printed material is ordinary or normal paper.
  • a data carrier assumes the form of an intermediate carrier which comprises a drum 1.
  • a recording head comprises an electrode comb 6 of known construction which is connected to a gas bearing mechanism indicated generally at reference numeral 9.
  • the gas bearing mechanism 9 includes a pair of elongated enclosures or housings 5 which extend essentially transversely of the parallel axes of the drum 1 and the electrode comb 6.
  • the gas bearing mechanism 9 provides a cushion of gas (for example, air) between the electrode comb recording head 6 and the data carrier 1, and in operation the bearing mechanism 9 and the recording head which is connected thereto "floats" on this cushion of gas.
  • a cushion of gas for example, air
  • each of the enclosures 5 are provided with a gas inlet 3 for receiving a supply of gas under pressure.
  • the gas is emitted from chambers 5a formed within the enclosures 5 through porous walls 4 which form part of the enclosures 5 and specifically that portion of the wall thereof which faces the surface of the data carrier 1.
  • the porous walls 4, and particularly the surfaces 4a thereof which are disposed in proximity to the outer surface of the drum 1, are curved and shaped complementarily to the cylindrical configuration of the drum 1.
  • the gas bearing mechanism 9 is, of course, movable with respect to the drum 1 and for that purpose the enclosures 5 are connected to a pair of holders or mounting brackets 8 by means of a pair of springs or other resilient members 7.
  • the mounting brackets 8 are, of course, arranged by means not shown such that they remain in fixed assembly with respect to the axes of the drum 1.
  • the distance or gap between the recording head 6 and the data carrier 1 may be varied by varying the pressure of the gas being supplied through the gas inlet 3 to the chambers 5a. As the gas pressure increases the gap increases, and as the gas pressure decreases so does the gap decrease.
  • the recording head 6 is adjusted between the elongated or runner-like enclosures 5 in a manner such that an optimum gap, resulting from the known Paschen curve, is formed between the electrode peaks of the recording head 6 and the dielectric layer 2 formed on the drum 1.
  • a cylindrical drum 1 has been utilized as the data carrier. It will be appreciated that other data carriers, such as strips, can be advantageously utilized as well. Furthermore, while the invention has been described in association with the transfer electrographic printing process, it is not limited thereto, and the concept of utilizing a gas bearing mechanism for the purpose of spacing the recording head can also be utilized in the direct electrographic printing of paper.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Common Mechanisms (AREA)
  • Ink Jet (AREA)
US05/681,726 1975-05-05 1976-04-29 Non-mechanical printer operating in accordance with an electrographic process Expired - Lifetime US4074283A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19752519997 DE2519997A1 (de) 1975-05-05 1975-05-05 Nach dem elektrografischen verfahren arbeitender nichtmechanischer drucker
DT2519997 1975-05-05

Publications (1)

Publication Number Publication Date
US4074283A true US4074283A (en) 1978-02-14

Family

ID=5945809

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/681,726 Expired - Lifetime US4074283A (en) 1975-05-05 1976-04-29 Non-mechanical printer operating in accordance with an electrographic process

Country Status (8)

Country Link
US (1) US4074283A (da)
BE (1) BE841464A (da)
CH (1) CH593803A5 (da)
DE (1) DE2519997A1 (da)
FR (1) FR2310223A1 (da)
GB (1) GB1501557A (da)
IT (1) IT1059771B (da)
NL (1) NL7604224A (da)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168506A (en) * 1977-09-12 1979-09-18 Rca Corporation Film guide for optical scanners
US4257054A (en) * 1978-08-02 1981-03-17 Ricoh Company, Ltd. Recording apparatus
US5315323A (en) * 1991-03-22 1994-05-24 Ricoh Company, Ltd. Color image forming apparatus with means for biasing a recording head
US5495273A (en) * 1993-03-02 1996-02-27 Brother Kogyo Kabushiki Kaisha Image recording apparatus having spacer between aperture electrode and opposing electrode
US20040027414A1 (en) * 2002-08-12 2004-02-12 Miguel Boleda Printing on surfaces
DE112008002058B4 (de) * 2007-07-30 2019-01-24 Hewlett-Packard Development Company, L.P. Elektrographische Vorrichtung und elektrographisches Verfahren zum Erzeugen eines latenten Bilds auf einer Bilderzeugungsoberfläche
WO2019177623A1 (en) 2018-03-16 2019-09-19 Hewlett-Packard Development Company, L.P. Air bearings
EP3765907A4 (en) * 2018-03-16 2021-09-01 Hewlett-Packard Development Company, L.P. AIR BEARING

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258372A (en) * 1978-04-14 1981-03-24 Ricoh Company, Ltd. Small clearance retention apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041612A (en) * 1958-06-27 1962-06-26 Vickers Electrical Co Ltd Heads for magnetic storage drums
US3132328A (en) * 1958-09-19 1964-05-05 Ferranti Packard Ltd Reading and writing head mounting means
US3835262A (en) * 1973-06-04 1974-09-10 Zenith Radio Corp Video disc cutting using pressurized air to control depth of grooves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041612A (en) * 1958-06-27 1962-06-26 Vickers Electrical Co Ltd Heads for magnetic storage drums
US3132328A (en) * 1958-09-19 1964-05-05 Ferranti Packard Ltd Reading and writing head mounting means
US3835262A (en) * 1973-06-04 1974-09-10 Zenith Radio Corp Video disc cutting using pressurized air to control depth of grooves

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168506A (en) * 1977-09-12 1979-09-18 Rca Corporation Film guide for optical scanners
US4257054A (en) * 1978-08-02 1981-03-17 Ricoh Company, Ltd. Recording apparatus
US5315323A (en) * 1991-03-22 1994-05-24 Ricoh Company, Ltd. Color image forming apparatus with means for biasing a recording head
US5495273A (en) * 1993-03-02 1996-02-27 Brother Kogyo Kabushiki Kaisha Image recording apparatus having spacer between aperture electrode and opposing electrode
US20040027414A1 (en) * 2002-08-12 2004-02-12 Miguel Boleda Printing on surfaces
DE112008002058B4 (de) * 2007-07-30 2019-01-24 Hewlett-Packard Development Company, L.P. Elektrographische Vorrichtung und elektrographisches Verfahren zum Erzeugen eines latenten Bilds auf einer Bilderzeugungsoberfläche
WO2019177623A1 (en) 2018-03-16 2019-09-19 Hewlett-Packard Development Company, L.P. Air bearings
EP3765907A4 (en) * 2018-03-16 2021-09-01 Hewlett-Packard Development Company, L.P. AIR BEARING
EP3765906A4 (en) * 2018-03-16 2021-09-01 Hewlett-Packard Development Company, L.P. AIR BEARINGS
US11150599B2 (en) 2018-03-16 2021-10-19 Hewlett-Packard Development Company, L.P. Air bearings
US11294323B2 (en) 2018-03-16 2022-04-05 Hewlett-Packard Development Company, L.P. Air bearings

Also Published As

Publication number Publication date
IT1059771B (it) 1982-06-21
NL7604224A (nl) 1976-11-09
GB1501557A (en) 1978-02-15
FR2310223A1 (fr) 1976-12-03
CH593803A5 (da) 1977-12-15
FR2310223B3 (da) 1979-01-19
DE2519997A1 (de) 1976-11-18
BE841464A (fr) 1976-11-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SIEMENS NIXDORF INFORMATIONSSYSTEME AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SIEMENS AKTIENGESELLSCHAFT A GERMAN CORP.;REEL/FRAME:005869/0374

Effective date: 19910916